Treasure hunt

"In Treasure Hunt, Montalbano is hailed as a hero after news cameras film him scaling a building-- gun in hand-- to capture a pair of unlikely snipers. Shortly after, the inspector begins to receive cryptic messages in verse from someone challenging him to go on a 'treasure hunt.' Intrigued, he accepts, treating the messages as amusing riddles-- until they take a dangerous turn" -- from publisher's web site.